KR20020087425A - Deflection yoke device - Google Patents

Abstract

Deflection yoke 3 for deflecting the electron beam emitted from the electron gun of the color cathode ray tube in the horizontal and vertical directions, coma correction coils 18a and 18b disposed so as to face the electron beam on the electron gun side of the deflection yoke; In the structure provided with the pair of cores 17a and 17b in which the correction coil was wound, the slide mechanism 19 is further provided for each core to slid the coma correction coil. It is possible to correct misconvergence with a simple configuration without lowering the sensitivity of the coma correction coil.

Description

Deflection yoke device {DEFLECTION YOKE DEVICE}

In general, the misalignment between the central axis of the deflection yoke device and the central axis of the color cathode ray tube, and the central axes called the longevity of the deflection yoke intersect at a predetermined angle greatly affect the convergence characteristics. As a countermeasure, the following technique is disclosed in Japanese Patent Laid-Open No. 11-54067.

As shown in FIG. 8, the deflection yoke device 1 arranges the horizontal and vertical deflection coils 2 on the insulating frame 21 for deflecting the electron beam emitted from the tank gun of the color cathode ray tube in the horizontal and vertical directions. And configured deflection yoke 3. On the electron gun side of the deflection yoke 3, a pair of U-shaped cores 4a and 4b, in which four-pole coma correction coils 5a and 5b are wound, is disposed to face each other with the passage of the electron beam interposed therebetween. The U-shaped cores 4a and 4b can slide in the vertical direction or the left and right directions by a slide mechanism (not shown).

According to this structure, when the YH misconvergence shown in FIG. 9A has arisen by the shift | deviation of the center axis | shaft of the up-down direction of a color cathode ray tube and the deflection yoke 3, a pair of U which has coma correction coils 5a and 5b. The female cores 4a and 4b are slid in the vertical direction indicated by the arrows in Fig. 10A. Thereby, YH misconvergence by the misalignment of the center axis | shaft of a color cathode ray tube and the deflection yoke 3 can be correct | amended, even if the deflection yoke 3 is not driven. Moreover, when Yv misconvergence shown in FIG. 9B has arisen by the shift | deviation of the center axis | shaft of the color cathode ray tube and the deflection yoke 3 to the left-right direction, a pair of U-shaped cores with coma correction coils 5a and 5b ( 4a, 4b) are slid in the left and right directions indicated by arrows in Fig. 10B. Thereby, Yv misconvergence by the misalignment of the center axis | shaft of the color cathode ray tube and the deflection yoke 3 can be correct | amended, even if the deflection yoke 3 is not performed.

However, in the above configuration, in order to correct misconvergence, as shown in FIGS. 10A and 10B, a space or a slide mechanism is required for sliding the U-shaped cores 4a and 4b from the solid line to the dotted line in the vertical direction or the horizontal direction. Become. As a result, the distance from the electron beam to the tip ends of the U-shaped cores 4a and 4b may increase, resulting in a decrease in the sensitivity (efficiency) of the coma correction coils 5a and 5b. Moreover, there exists a problem that a structure becomes complicated by using the mechanism component for sliding the U-shaped cores 4a and 4b.

The present invention relates to a deflection yoke device used for color cathode ray tubes such as TV receivers, computer displays, and the like.

1 is a cross-sectional view showing a color cathode ray tube in which a deflection yoke device according to Embodiment 1 of the present invention is installed;

2 is a perspective view from the side of the same deflection yoke device;

3 is a rear view showing the same deflection yoke device;

4 is a diagram showing a magnetic force line when a bobbin of a 4-pole coma correcting coil is slid in the same deflection yoke device;

5 is a rear view showing the deflection yoke device of the second embodiment of the present invention;

6 is a rear view showing the deflection yoke device of Embodiment 3 of the present invention;

7A is a rear view showing a part of the deflection yoke device of Embodiment 4 of the present invention;

7B is a back view showing the operation of the same deflection yoke device;

8 is a perspective view of a conventional deflection yoke device viewed from the side;

9A to D are views showing a state of misconvergence,

10A and 10B are rear views showing the operation of the conventional deflection yoke apparatus.

Disclosure of the Invention

An object of the present invention is to provide a deflection yoke device capable of correcting misconvergence with a simple configuration without lowering the sensitivity of the coma correction coil.

The deflection yoke device of the present invention includes a deflection yoke for deflecting an electron beam emitted from an electron gun of a color cathode ray tube in a horizontal and vertical direction, and a coma correction coil disposed to face the electron beam on an electron gun side of the deflection yoke; In the structure provided with a pair of core by which the said coma correction coil was wound, further, the said coma correction coil is provided with the slide mechanism which makes it possible to slide each said coma correction coil.

By this structure, since the tip of a core is provided in contact with or adjacent to the neck part of a color cathode ray tube, the fall of the sensitivity of a coma correction coil can be prevented. In addition, since the coma correction coil is simply configured to be slidable with respect to the core, it is not necessary to add a mechanical component for sliding the core as in the prior art.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

(Embodiment 1)

1 shows a colored cathode ray tube 9 to which the deflection yoke device 10 of the embodiment of the present invention is mounted. The color cathode ray tube 9 includes a panel 11 having a fluorescent surface 11a, a frame 13 holding a shadow mask 12 disposed at a position facing the fluorescent surface 11a, and an electron gun 15 disposed therein. It consists of the neck pipe part 14a which was made, and the funnel part 14 which connects between the neck pipe part 14a and the panel 11. As shown in FIG. As shown for convenience in the following description, the horizontal direction (actually orthogonal to the surface of the drawing) is called a left and right direction, and the vertical direction is called an up and down direction.

The deflection yoke device 10 is provided on the outer circumference of the funnel portion 14 to deflect the electron beams 15R, 15G, 15B emitted from the electron gun 15. The deflection yoke device 10 includes a deflection yoke 3, a pair of U-shaped cores 17a and 17b, and a slide mechanism 19, as also shown in FIGS. 2 and 3. The deflection yoke 3 has a pair of horizontal and vertical coils 2 each for generating a magnetic field which deflects the electron beams 15R, 15G and 15B emitted from the electron gun 15 in the horizontal and vertical directions. The U-shaped cores 17a and 17b are disposed to face each other with the electron beams 15R, 15G, and 15B interposed between the electron gun side of the deflection yoke 3, and the four-pole coma correction coils 18a and 18b at the bottom of the U-shape. This is wound up. The slide mechanism 19 makes the coma correction coils 18a and 18b slideable with respect to the U-shaped cores 17a and 17b. Coma correction coils 18a and 18b are connected in series to the vertical deflection coil 2.

The insulating frame 21 of the deflection yoke 3 has a truncated conical wall surface 21a provided with horizontal and vertical deflection coils 2 and a core integrally provided with the wall surface 21a on the small diameter side of the wall surface 21a. The plate part 21b is included. The convex part 21c is formed in the core mounting plate part 21b. The core attachment plate portion 21b does not necessarily need to be integral with the wall surface 21a, and may be provided as a member separate from the insulating frame 21.

The U-shaped cores 17a and 17b are fixed to the convex portion 21c of the core attachment plate portion 21b. The coma correction coils 18a and 18b are wound by the cylindrical bobbins 20a and 20b as shown in FIG. 3. The slide mechanism 19 makes the inner diameters of the bobbins 20a and 20b larger than the outer diameters of the U-shaped cores 17a and 17b, and the bobbins 20a and 20b above the middle portion S of the U-shaped cores 17a and 17b. 20b) is configured to be slidable in the left-right direction. Thereby, in addition to the correction of the Yv misconvergence shown in FIG. 9B described with respect to the prior art, the VG gradient misconvergence shown in FIG. 9C can be corrected due to the rotational misalignment of the deflection yoke 3 with respect to the color cathode ray tube. After these modifications, the U-shaped cores 17a and 17b and the bobbins 20a and 20b are fixed by hot melt adhesive.

The inner diameters of the bobbins 20a and 20b and the outer diameters of the U-shaped cores 17a and 17b are preferably set to such a magnitude that the mutual positional relationship is fixed by the frictional force. In other words, if no external force is applied, the fitting state is such that the positions of the bobbins 20a and 20b do not shift. As an example of the dimensions, good results are obtained when the inner diameters of the bobbins 20a and 20b are 6 mm-0 to (+0.2) mm, and the outer diameters of the U-shaped cores 17a and 17b are 6 mm-0.05 to (+0) mm. .

Before bonding the bobbins 20a and 20b and the U-shaped cores 17a and 17b with an adhesive, the bobbins 20a and 20b are temporarily fixed to the center of the U-shaped cores 17a and 17b. For those requiring correction, the positions of the bobbins 20a and 20b are corrected by hand. Finally, the bobbins 20a and 20b and the U-shaped cores 17a and 17b are fixed with an adhesive regardless of whether the position is corrected or not.

In addition, the length L1 of the intermediate portion S of the U-shaped cores 17a and 17b is larger than the coil winding length L2 of the bobbins 20a and 20b. In addition, the tip ends of the U-shaped cores 17a and 17b are arranged to be in contact with or close to the outer circumferential surface of the neck tube portion 14a.

About the deflection yoke apparatus comprised as mentioned above, the action and effect are demonstrated below.

The deflection yoke device 10 of the present invention is provided with a slide mechanism 19 that allows the coma correction coils 18a and 18b to slide left and right with respect to the U-shaped cores 17a and 17b, as shown in FIG. Likewise, the magnetic field generated from both ends of the U-shaped cores 17a and 17b can be made asymmetric. Therefore, in addition to the correction of the Yv misconvergence shown in FIG. 9B as described above, the VG gradient misconvergence shown in FIG. 9C can also be corrected. As a result, an optimal image can be obtained.

The magnetic field generated from both ends of the U-shaped core 17a (17b) becomes asymmetric for the following reason. First, since the length from the coma correction coil 18a (18b) to the tip of the core 17a (17b) is different from right to left, a difference occurs in the strength of the magnetic fields respectively coming out from the left and right core tips. Second, since the position of the coma correction coil 18a (18b) is shifted to the left and right from the center of the U-shaped core 17a (17b), radiation applied directly from the coma correction coil 18a (18b) itself. This is because the influence of the magnetic field on the electron beam becomes asymmetrical.

In addition, in the deflection yoke device 10 of the present invention, the U-shaped cores 17a and 17b are fixed to the core attachment plate portion 21b while keeping their ends in contact with or adjacent to the neck pipe portion 14a. Therefore, as in the prior art shown in Figs. 10A and 10B, the positions of both ends of the U-shaped cores 4a and 4b do not change with respect to the neck portion. Therefore, the fall of the sensitivity of the coma correction coils 18a and 18b by changing the position of the both ends of a U-shaped core can be prevented.

In addition, since the deflection yoke device 10 of the present invention is configured to simply slide the bobbins 20a and 20b in the left and right directions with respect to the U-shaped cores 17a and 17b, the U-shaped cores 4a and the same as the prior arts. No new mechanism parts for sliding 4b) are needed. As a result, compared with the prior art, the configuration can be simplified, and the space for installing the U-shaped cores 17a and 17b in the core attachment plate portion 21b can also be reduced.

Next, the deflection yoke device 10 of the present invention shown in Figs. 2 and 3 is mounted on the color cathode ray tube 9 shown in Fig. 1, and the bobbins 20a and 20b are attached to the U-shaped cores 17a and 17b. The experiment which confirmed the effect about the correction amount of VG slope misconvergence when it slides to the left-right direction is demonstrated.

A 46 cm computer monitor cathode ray tube is used as the color cathode ray tube 9, and the U-shaped cores 17a and 17b have a width (B) = 6 mm and a length (L1) = 20 mm in the middle portion (S). (20a, 20b) was made into coil winding length L2 = 14 mm and coil winding = 80 turns.

In addition, the said correction amount means the distance which an electron beam moves to a horizontal direction in the peripheral part of a panel shown in FIG. 9C, when one side of the bobbin 20a, 20b in FIG. 3 slides left or right from the center Y. Say E).

As a result of the experiment, in the deflection yoke apparatus of the present invention, when the bobbins 20a and 20b slide a distance of 20% of the coil winding length L2 from the center Y to the left or the right, the distance E is 0.1. It was confirmed that the mm change.

In addition, although the slide mechanism 19 of this embodiment demonstrated the case where the bobbin 20a, 20b was slidable to the left-right direction with respect to the intermediate part S of U-shaped core 17a, 17b, The effect is obtained without being limited. For example, cylindrical bobbins in which a coma correction coil is wound are provided on both legs of the U-shaped cores 17a and 17b, and the inner diameter of the bobbin is larger than the outer diameter of the U-shaped cores 17a and 17b. The bobbin may slide on both legs of the U-shaped cores 17a and 17b in the vertical direction. According to this structure, the YH misconvergence shown in FIG. 9A can be correct | amended by the shift | offset | difference of the central axis of the color cathode ray tube and the deflection yoke 3 in the up-down direction.

(Embodiment 2)

The deflection yoke apparatus of Embodiment 2 is demonstrated with reference to FIG. In Embodiment 1, although the core 17a, 17b was formed in U-shape, the structure which arrange | positioned the pair of core 17a, 17b in the up-down direction was illustrated, but it is not limited to this. Depending on the type of misconvergence, the shape and the position can be appropriately selected.

For example, when correcting the VCR misconvergence shown in FIG. 9 due to the deviation of the central axis in the vertical direction between the color cathode ray tube and the deflection yoke 3, the configuration as shown in FIG. 5 is used. In this configuration, the bobbins 32a and 32b are provided with a pair of E-shaped cores 30a and 30b in the left and right directions, and the coma correction coils 31a and 31b wound around the leg portions of the E-shaped cores 30a and 30b, respectively. )). By sliding the bobbins 32a and 32b in the left and right directions, VCR misconvergence can be reduced.

(Embodiment 3)

The deflection yoke apparatus of Embodiment 3 is demonstrated with reference to FIG. The configuration of this embodiment is used to correct the Yv misconvergence shown in FIG. 9B. As shown in FIG. 6, a pair of I-shaped cores 40a and 40b are provided in the left-right direction, and bobbins 42a and 42b in which the coma correction coils 41a and 41b are wound on each rod-shaped part are mounted. . Yv misconvergence can be reduced by sliding bobbins 42a and 42b in the left and right directions, respectively.

(Embodiment 4)

A part of the deflection yoke apparatus of Embodiment 3 is shown to FIG. 7A, B. FIG. In this embodiment, as shown in FIG. 7A, the inner diameter (shown with a dotted line) of the bobbin 20a is set larger than the outer diameter (shown with a dotted line) of the U-shaped core 17a. As a result, as shown in Fig. 7B, the coma correction coil 18a is not only slideable, i.e., parallel, but also rotated with respect to the U-shaped core 17a. That is, the coma correction coil 18a can slide in the axial direction of the U-shaped core 17a, and can rotate in which the angle with respect to the axis of the U-shaped core 17a changes. This configuration also makes the magnetic field asymmetrical. For example, when the coma correction coil 18a is positioned at the center of the U-shaped core 17a to be rotated only, asymmetry of the influence of the radiation magnetic field from the coma correction coil 18a is obtained.

In order to obtain a good result by the above-described rotational movement, the dimension may be set so that the U-shaped core 17a, that is, the coma correction coil 18a, can be rotated in the range of 5 ° or more and 45 ° or less. As an example of a dimension, what is necessary is just to make the inner diameter of the bobbin 20a into 13 mm, and to make the outer diameter of the U-shaped core 17a into 6 mm.

In this embodiment, since there is a large gap between the U-shaped core 17a and the bobbin 20a, the position of the coma correction coil 18a is not determined until it is finally fixed by an adhesive agent. Therefore, the height of protrusion of the convex portion 21c of the core attaching plate portion 21b in FIG. 2 is appropriately determined, and the bobbin 20a is interposed between the core attaching plate portion 21b and the U-shaped core 17a with an appropriate force. It is desirable to wear. As a result, the coma correction coil 18a can be temporarily fixed and the position can be easily corrected.

The coma correction coils 18a, 18b, 31a, 31b, 41a, and 41b described in the above embodiments are connected in series with the vertical deflection coil 2, but are not limited to this. Can be modified.

According to the present invention, it is possible to provide a deflection yoke device which can correct misconvergence with a simple configuration without lowering the sensitivity of the coma correction coil. As a result, an optimal image can be obtained when this deflection yoke device is attached to the cathode ray tube.

Claims (7)

A deflection yoke for deflecting the electron beam emitted from the electron gun of the color cathode ray tube in the horizontal and vertical directions; A coma correction coil disposed to face the electron beam on the electron gun side of the deflection yoke; And In a deflection yoke device having a pair of cores in which the coma correction coil is wound, A deflection yoke device is provided for each of said cores, the slide mechanism which makes it possible to slide each said coma correction coil. The method of claim 1, The deflection yoke device, characterized in that the core is any one of the I-shaped, U-shaped, or E-shaped. The method of claim 2, And said core is U-shaped, and said coma correction coil is disposed on a U-shaped bottom or both legs. The method of claim 2, And said core is E-shaped, and said coma correction coil is disposed on each leg of said E-shape. The method according to claim 1 or 2, The deflection yoke device, wherein the pair of cores are disposed in an up-down direction or left-right direction of the color cathode ray tube. The method according to any one of claims 1 to 3, The said slide mechanism is comprised by winding the said coma correction coil to the cylindrical bobbin attached to the said core, making the inner diameter of the said bobbin larger than the outer diameter of the said core, and making the said bobbin slidable on the said core. Deflection yoke device, characterized in that. The method of claim 4, wherein The deflection yoke device, wherein the coma correction coil is capable of rotational movement in an axial slide of the core and a direction in which an angle with respect to an axis of the core changes.